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0a3c23bcf6
It's tricky to reschedule the timer irq correctly (due to race conditions with the irq) and in practice it's very rarely needed. Handle the special cases in the generic sched.c code so that the board code doesn't have to handle it. Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
133 lines
2.2 KiB
C
133 lines
2.2 KiB
C
// Main starting point for host simulator.
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//
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// Copyright (C) 2016 Kevin O'Connor <kevin@koconnor.net>
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//
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// This file may be distributed under the terms of the GNU GPLv3 license.
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "board/misc.h" // timer_from_us
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#include "board/irq.h" // irq_disable
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#include "sched.h" // sched_main
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/****************************************************************
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* Interrupts
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****************************************************************/
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irqstatus_t Interrupt_off;
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void
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irq_disable(void)
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{
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Interrupt_off = 1;
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barrier();
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}
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void
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irq_enable(void)
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{
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barrier();
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Interrupt_off = 0;
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}
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irqstatus_t
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irq_save(void)
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{
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irqstatus_t flag = Interrupt_off;
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irq_disable();
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return flag;
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}
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void
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irq_restore(irqstatus_t flag)
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{
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barrier();
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Interrupt_off = flag;
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}
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/****************************************************************
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* Timers
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****************************************************************/
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uint32_t
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timer_from_us(uint32_t us)
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{
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return 0; // XXX
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}
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void
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timer_periodic(void)
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{
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}
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uint32_t
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timer_read_time(void)
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{
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return 0; // XXX
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}
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uint8_t
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timer_try_set_next(uint32_t next)
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{
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return 1;
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}
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/****************************************************************
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* Turn stdin/stdout into serial console
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****************************************************************/
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// XXX
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char *
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console_get_input(uint8_t *plen)
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{
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*plen = 0;
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return NULL;
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}
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void
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console_pop_input(uint8_t len)
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{
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}
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// Return an output buffer that the caller may fill with transmit messages
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char *
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console_get_output(uint8_t len)
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{
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return NULL;
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}
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// Accept the given number of bytes added to the transmit buffer
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void
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console_push_output(uint8_t len)
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{
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}
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/****************************************************************
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* Startup
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****************************************************************/
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// Periodically sleep so we don't consume all CPU
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static void
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simu_pause(void)
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{
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// XXX - should check that no timers are present.
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usleep(1);
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}
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DECL_TASK(simu_pause);
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// Main entry point for simulator.
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int
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main(void)
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{
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// Make stdin non-blocking
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fcntl(STDIN_FILENO, F_SETFL, fcntl(STDIN_FILENO, F_GETFL, 0) | O_NONBLOCK);
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sched_main();
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return 0;
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}
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